from wptserve.utils import isomorphic_decode

def main(request, response):
    """
    Simple handler that returns an HTML response that passes when the required
    Client Hints are received as request headers.
    """
    values = [b"Device-Memory", b"DPR", b"Viewport-Width", b"Sec-CH-UA", b"Sec-CH-UA-Mobile"]

    result = u"PASS"
    log = u""
    for value in values:
        should = (request.GET[value.lower()] == b"true")
        present = request.headers.get(value.lower()) or request.headers.get(value)
        if present:
            log += isomorphic_decode(value) + u" " + str(should) + u" " + isomorphic_decode(present) + u", "
        else:
            log += isomorphic_decode(value) + u" " + str(should) + u" " + str(present) + u", "
        if (should and not present) or (not should and present):
            if present:
                result = u"FAIL " + isomorphic_decode(value) + u" " + str(should) + u" " + isomorphic_decode(present)
            else:
                result = u"FAIL " + isomorphic_decode(value) + u" " + str(should) + u" " + str(present)
            break

    response.headers.append(b"Access-Control-Allow-Origin", b"*")
    body = u"<script>console.log('" + log + u"'); window.parent.postMessage('" + result + u"', '*');</script>"

    response.content = body
